#include<stdio.h>


int Sum(int n)
{
    int i=0;
    int sum=0;
    for(i=0;i<=n;i++)
    {
        sum += i;
    }
    return sum;
}

int main()
{
    printf("hello world!\n");
    printf("hello world!\n");
    printf("hello world!\n");
    printf("hello world!\n");
    printf("hello world!\n");
    printf("hello world!\n");

    int ret = Sum(100);

    printf("result= %d\n",ret);
    return 0;
}
